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CO 2 injection implies displacement of water, and thus aquifer pressure build-up or displacement of water to other rocks. Both may be problematic. Pressure build-up may result in seal failure and / or restrict injection rates, whereas displacement of brine to other rocks may have undesired effects on the environment, such as contamination of potable drinking water. CO 2 storage capacity also depends on pressure management, especially in closed systems where displaced water cannot be adequately displaced in the subsurface or vented to the surface. OTC 23961The Snøhvit pressure build-up and subsequent analyses demonstrated the importance of assessment of the maximum safe injection pressure, honouring the fact that the injected CO 2 resulted in thermal stress in the formation close to the wellbore. The work also highlighted the importance of knowing the accuracy of the present day stress and fracture propagation dynamics. Furthermore, the injection demonstrated the importance of having good reservoir analogues for flow modelling in formations with sparse well data.